Telephone-receiver



J. C. KANE.

TELEPHONE RECEIVER.

APPLICATION FILED OCT. 21, I919.

Patented Dec. 14, 1920.

Ila I0 WITNESSES lNVE/VTUI? JdH/v- C. KANE,

A TTORNEYS PATENT OFFICE.

O N c. KANE, or DETROIT, MICHIGAN.

TELEPHONE-RECEIVER.

Specification of Letters Patent.

Patented Dec. 14., 1920.

Application filed October 21, 1919. Serial No. 332,151.

1 all whom it may concern Be it known that 1, JOHN C. KANE, a citizen ofthe United States, and a resident of Detroit, in the county otWayne andState oi Michigan, have made certain new use- .t'ul Improvements inTelephone-Receiters, of which the following is a specification.

My invention is an improvementin telehone receivers of tnecharacterspecially tapted for radio work, wherein a iragm is provided balancedinthe ic field between the pole pieces, t 1' ice the s ress per 06 of a1 steel diaphra d every pow ietio further object is "to provide a racewherein the vibratiorirc thzi. s as well as those produce; i of themolecules in the pole .izeol. 17.1 the drawings Figure 1 is a peroectiveview O1 proved receiver i 2 is a diagi the cir uit coin 3 1s alongitu receiver;

Fig. l is a section on the line 3. In the present embodiments-t theinven- 1s hnal section tion, two coils 1 and2 are provided, mounted uponsott'iron pole pieces 3 and 4:, the said .pole pieces being arranged inaxial alinement, as shown, with their adjacent ends spaced apart farenough to receive the diaphragm. 5 between them. I

The diaphragm is held between the sections Grand 7 of an inclosingshell, the said sections being cup-shaped; and being con-- nected attheir adjacent ends by a ring 18 which is threaded on to the sections.Eac section 6 and 7 has an internally threade opening 9 at its outer endfor engaging the adjacent pole piece each polepiece having a threadedportion, beyond the coil for engaging the internally threaded opening.

The. binding posts 10 and '11, which are connected with the terminals ofvthe respec tive coils, extendthrough openings in the endsof'the'sections 6 and 7 and are insulated therefrom by tubes 12 andwashers 13 of suitable insulating material. As shown in Fig. 3,.thebores of the'pole pieces 3 and 4 flare at theirinner ends toward thediaphragm and the diaphragm is firmly held between thesections 6 and 7of the shell, which incloses the coils.

h uts 1% are threaded on to the pole pieces outside of the shellsections, and by means of these nuts the pole pieces and the coils maybe adjusted toward and from the diaphragm to perfectly balance the same.

The inclosing shell 6'? is of hard steel e and negative poles in theinterior dc of the pole pieces and tnese poles will "eir unlike endsadjacent. 'That is we pole pieces will be similarly ar- The coils arewound to a very high resistance, and they so arranged when a currentpasses through them they each other tha is the like ends will Nowthe'diaphragm is balwhen a cur ent passes through s, the balance 0" sheiield is shiftech 1 the di- -phragm swept with it.- An inof the fieldstrength will intensify of the diaphragm up to saturar pale pieces. Thepole pieces are 'tarev nt as much aspossible eddy currents by means ofthe nuts at the outer end they may be adqusted to get the diaphragm atthe critical balance. This diaphragm may be of steel. and of .015 inch.

Flexible tubes 15 extend from the ends of the pole pieces, the saidtubes being arranged upon reduced portions 16, at the outer ends of thepole pieces, and each tube 15 has an ear piece 17 at the end remote fromthe receiver for engagingwithin the ears of the user. The receiver issupported from the neck by means (gt a tape or strap 18, whose ends areconnected with the shell on either side of the ring 8. n Thus thereceiver is supported on the chest, and the tubes 15 are of ,sufiicientlengthto engage the ears without strain. 1

In use, the receiver is arranged in the line 18 connecting the aerial 19with the ground in the manner shown in Fig. 2. Lead wires 20 connectwith the binding post 10 at the ends of the receiver, and a lead wire 21connects the binding post 1 2.

The inclosing shell is permanently mag netizedso as to induce positiveand negative oles in the interior ends of the pole pieces. hismagnet'entirely inclosihg the coil, as it does, performs theveryimportant funcpe nently magnetized so as to induce -'closing, the coilsand having openings 4 ends of the pole pieces, and

tion of confining the magnetic field of the coil within the. instrument,making for strongersignals. r k

I claim 3 1. A receiver of the character specified, comprising a pair ofalined pole pieces, a coil on each pole piece, a sectional shellinclosing the coils and having openings through which the pole piecesare threaded, 4 a ring connecting the adjacent end of the shell-sectionsand having threaded. engagement therewith, a diaphragm held between theshell sections and between the adjacent ends of the pole pieces, andmeans for adjusting the coils and pole pieces toward'andfrom thediaphragm, said means comprising lock nuts threaded onto the pole piecesoutside of the shell sections.

2. A receiver Ofs the character specified,

comprising a pair of ali ned pole pieces, a

coil on'each pole piece, a sectional shell inthrough which the polepieces are threaded, a ring connecting the adjacent end'of the shellsections-and having-threaded engagement therewith, a-diaphragm heldbetween the shell sections and between the adjacent eans for ad-'justing the coils and pole pieces toward and from the diaphragm. I 3. Areceiver ofthe character specified, comprising a pair of alinedpole'pieces, a

I w coil on each pole piece, a sectional shell incoi closing the coilsand having openings through which the pole pieces are threaded,

a ring connecting the adjacent ends of the shell sections, a diaphragmheld between the shell sections and between the adjacent ends of thepole pieces, and m'eans for adjusting the coils and pole pieces towardand from the diaphragm. v

4. A. IBCBIVGI" of the character specified, comprising a shellsupporting a diaphragmtraiisversely thereof, pole pieces carrying sadjustably connected with the endwf. the shell .for movement toward andfrom the diaphragm, said pole pieces having flexible tubes connectedwith their outer ends and carrying 'ear pieces. E

5. A receiver ofithe character specified,

prising alined tubular pole pieces, each pole piece carrying a coil,said'coils when electrified havin 'their like ends adjacent, a diaphragmheld between adjacent ends of the,

c pole pieces, means for adjusting the pole pieces towardand from thediaphra and receiving tubes connected with t e 'pole pieces.

6. A receiver of the character specified comprising a shell supporting adiaphragm transversely thereof, pole pieces ad ustably connected withthe ends of the shell for movement toward aid from the diaphragm, said"shell and the pole pieces being permanently magnetized, and the polepieces having their unlike poles adjacent, coils carried by the ,polepieces and adapted to be inter-v posed in electrical circuit in seriesin such mannerthat when energized their like poles will be adjacent. l

7. A receiver of the character specified comprising a shell supporting adiaphragm transversely thereof, ,pole pieces connected with the ends ofthe shell for movement .toward and from the diaphragm, said shell andthe pole pieces being permanently magnetized, and the pole ,pieceshaving their imlike poles adjacent, coils carried by the pole pieces andadapted to be interposed in electrical circuit in "series in such mannerthat when energized their like poles will beadjacent. w

8. A receiver of the character specified comprising a shell-having adiaphragm supported transversely thereof and-having pole pieces at itsends for movement toward and i from the shelha coil ongeach pole piece,said shell and pole piece being permanently mag-- netized so that theunlike poles of the pole pieces are adjacent and the coils beingarranged so that when energized theirlike poles will be adjacent.' ":9.A receiver of the character specified comprising a diaphragm, a polepiece at each face of the diaphragm, a coil carried by each -p0le piece,said pole pieces being permanentlymagnetized and having their unlikeends adjacent and t e coils being arranged so that when magnetized theirlike ends adjacent;

JOHN C. Kass;

